awneil
1
To be able to send an SMS, a device must have a valid Service Centre Address, SCA (aka Message Centre phone number, etc)
When reading a message in PDU mode, an SCA is included - Is it safe to assume that this SCA will be valid for use to send any reply ![:question: :question:](/images/emoji/twitter/question.png?v=5)
From my experience you don’t need to specify the SCA with most operators nowadays anymore…
awneil
3
I agree - but “most” is not sufficient!
![:frowning: :frowning:](https://emoji.discourse-cdn.com/twitter/frowning.png?v=12)